
<template>
  <div class="container">
    <!-- 固定导航 -->
    <van-nav-bar
      fixed
      left-arrow
      @click-left="$router.back()"
      title="小智同学"
    ></van-nav-bar>

    <!-- 聊天主体区域 -->
    <div class="chat-list"  >
      <div v-for="(item, index) in list" :key="index">
        <!-- 左侧是机器人小智 -->
        <!-- <template v-if="item.type === 'XZ'"> -->
          <div class="chat-item left" v-if="item.type === 'XZ'">
            <van-image
              fit="cover"
              round
              src="https://img.yzcdn.cn/vant/cat.jpeg"
            />
            <div class="chat-pao">{{ item.keyWord }}</div>
          </div>
        <!-- </template> -->

        <!-- 右侧是当前用户 -->
        <!-- <template v-else> -->
          <div class="chat-item right" v-else>
            <div class="chat-pao">{{ item.keyWord }}</div>
            <van-image
              fit="cover"
              round
              :src="$store.state.userInfo.photo"
            />
          </div>
        <!-- </template> -->
      </div>
    </div>

    <!-- 对话区域 -->
    <div class="reply-container van-hairline--top">
      <van-field v-model.trim="word" placeholder="说点什么...">
        <template #button>
          <span @click="send()" style="font-size: 12px; color: #999">提交</span>
        </template>
      </van-field>
    </div>
  </div>
</template>

<script>
import { io } from 'socket.io-client'
export default {
  name: 'UserChat',
  data () {
    return {
      word: '',
      list: []
    }
  },
  methods: {
    send () {
      if (this.word.length === 0) return false
      //   console.log(this.word)
      this.socket.emit('chat message', this.word)
      //   this.list.push(this.word)
      this.list.push({
        type: 'user',
        keyWord: this.word
      })
      this.word = ''
    }
  },
  created () {
    this.socket = io('ws://localhost:5522') // 协议为ws
    this.socket.on('connect', () => {
      console.log('建立连接成功了')
    })
    this.socket.on('chat message', (msg) => {
      console.log('服务回来的消息', msg)
      this.list.push({
        type: 'XZ',
        keyWord: msg
      })
    })
  }
}
</script>

<style lang="less" scoped>
.container {
  height: 100%;
  width: 100%;
  position: absolute;
  left: 0;
  top: 0;
  box-sizing: border-box;
  background: #fafafa;
  padding: 46px 0 50px 0;
  .chat-list {
    height: 100%;
    overflow-y: scroll;
    .chat-item {
      padding: 10px;
      .van-image {
        vertical-align: top;
        width: 40px;
        height: 40px;
      }
      .chat-pao {
        vertical-align: top;
        display: inline-block;
        min-width: 40px;
        max-width: 70%;
        min-height: 40px;
        line-height: 38px;
        border: 0.5px solid #c2d9ea;
        border-radius: 4px;
        position: relative;
        padding: 0 10px;
        background-color: #e0effb;
        word-break: break-all;
        font-size: 14px;
        color: #333;
        &::before {
          content: "";
          width: 10px;
          height: 10px;
          position: absolute;
          top: 12px;
          border-top: 0.5px solid #c2d9ea;
          border-right: 0.5px solid #c2d9ea;
          background: #e0effb;
        }
      }
    }
  }
}
.chat-item.right {
  text-align: right;
  .chat-pao {
    margin-left: 0;
    margin-right: 15px;
    &::before {
      right: -6px;
      transform: rotate(45deg);
    }
  }
}
.chat-item.left {
  text-align: left;
  .chat-pao {
    margin-left: 15px;
    margin-right: 0;
    &::before {
      left: -5px;
      transform: rotate(-135deg);
    }
  }
}
.reply-container {
  position: fixed;
  left: 0;
  bottom: 0;
  height: 44px;
  width: 100%;
  background: #f5f5f5;
  z-index: 9999;
}
</style>
